Automatic phonograph-stop



C. H. TAYLOR.

AUTOMATIC PHONOGRAPH STOP. APPLICATION FILED MAY17,1920.

1,400,638, Patented 1090. 20, 1921.

a. liar CHARLES H. TAYLOR, 0'15 CROSBY, MINNESOTA.

AUTOMATIC PHONOGRAPH-SJIOP.

ousse.

application filed may 37,

To all whom it may concern.

Be it known that l, Crmnnns ll. TAYLOR, a citizen of the United States,and a resident of Crosby, in the county of Crow Wing, State ofMinnesota, have invented a new and useful Improvement in AutomaticPhon'ograph-Stops, of which the following is a full, clear, andexactdescription.

My invention relates to improvements in automatic phonograph stops, andit consists in the combinations, constructions, and arrangements hereindescribed and claimed.

An object of my invention is to provide a stop for a phonograph or likesound repro ducing machine which is adapted to be automatically operatedto stop the rotation of. the turntable when the direction of movement ofthe tone arm of the machine to which the stop is applied has beenreversed.

A further object of my invention is to provide a device of the typedescribed in which a disk record provided with an inner eccentric grooveis employed to effect the reversal in direction of movement of the tonearm, whereby the device is operated to stop the sound reproducingmachine.

A further object of my invention is to provide a device of the typedescribed that will positively and instantly stop the operation of thesound reproducing machine to which applied when a needle carried by thetone arm reaches a predetermined point on the record.

A further object of my invention is to provide a device of the typedescribed that normally prevents rotation of the turntable of themachine when the tone arm is out of operative position.

A further object of my invention is to provide a device of the typedescribed that is relatively simple in construction and operation, notlikely to get out of order easily, and thoroughly practicalcommercially.

Other objects and advantages will appear in the following specification,and the novel features of the invention will be particularly pointed outin the appended claims.

N y invention is illustrated in the accompanying drawings, forming partof this application, in which Figure 1 is a plan view of a portion of asound reproducing machine showing the device applied, a portion of theparts shown being broken away,

Fig. 2 is a side view of the mechanism shown in Fig. 1.

Sp e cificati on of Letters Patent.

1920. Serial No. 381,847.

in carrying out my invention, 1 makeuse of a phonograph or like soundreproducing machine, a portion of the casing of which is denoted in theaccompanying drawings by 1. A turntable 2 is mounted for rotation on thecasing 1, a post 8 projecting above the central portion thereof. it tonearm l has a swivel connection at 5 with a supporting collar 6 which issecured to the casing 1 in an ordinary manner. The parts described sofar are ordinary in construction and form no part of my invention,enceptin so far as they cooperate with the parts about to be described.

1 provide an arm '7 which is bent upwardly at 8 and then bent at 9parallel to the main portion thereof. A bar 10 is rigidly secured to theupper portion in any suitable manner, as by welding, and cooperates withthe end of the arm 7, which is bent at 9, to form a clamp. Ahorizontally extending-portion 11 of a bracket 12, which is secured byscrews 13 to the tone arm 4, is received and clamped between the bar 10and the end of the arm 7 which is bent at 9. 1-1 bolt or pin 14 extendsthrough the bar 10, the horizontally extending portion 11, and the upperend of the arm 7. A nut 16 is screwed'on the end of the pin 14. A spring15 is disposed between the nut 16 and the upper end of the arm 7.,thereby exerting a tension against the latter which tends to prevent thearm 7 being pivotally moved about the pin 14. The tension of the spring15 may be lessened or increased by operation of the nut 16. -it is to benoted that the arm 7 has a pivotal connection with the bracket 12, butthat the free movement about its pivot is prevented by the clampingmeans described and by the provision of the spring 15. Consequently thearm 7 can be moved about its pivot only when a pressure has been appliedat the free end thereof.

The free end of the arm 7 is formed with a slot 17. A stud 18, which iscarried on the end of the lever 19, is disposed within the slot 17. Apost 20, which is preferably covered with leather or a like material, ismounted upon the lever 19 adjacent its outer end in position tofrictionally engage the edge of the turntable 2 when the device is inthe po sition pictured in the accompanying drawings. The extreme outerend 21 of the lever 19 is formed, as pictured in the drawings, forconvenience when it is desired to move the lever 19 by hand. A guidemember 22 1 by means of screws 24.

The lever 19 has a pivotal connection at 26 with a bar 25, as best seenin Fig. 1. The

other end of the bar 25 is pivoted at 27 to a fixed member 28. Thelatter is rigidly secured to the casing 1 in the position p1ctured inthe drawings by means of screws 29. A coil spring 34 has one end securedto the bar 25 adjacent its pivotal connection with the lever 19. Theother end of the coil spring 3 1 is secured to the adjacent end of thefixed member 28, whereby tension is exerted by the coil spring to drawthe bar 25 .in the direction of the fixed member 28, thereby tending tohold the post 20 against the edge of the turntable 2. A bumper 32, whichis formed with an upwardlybent end 33 which is adapted to engage theside edge of the bar 25, is adjustably secured to the fixed member 28 bymeans of a set screw 30 which is disposed within a slot 31. The slot 31extends substantially the entire length of the bumper 32 and permitsadjustment of the same with respect to the bar 25, whereby the normalposition of the post 20 may be regulated to positively prevent rotationof the turntable 2 when in the position illustrated.

From the foregoing description of the various parts of the device, theoperation thereof may be readily understood. A disk record 35 is placedupon the turntable 2. The end 21 of the lever 19 is moved in thedirection indicated by the arrow in Fig. 1. Since the lever 19 islocated at one side of the center of the turn table 2 and is fulcrumedat 26, the movement of the end 21 of the lever 19 in the direction ofthe arrow will move the post 20 out of engagement with the edge of theturntable 2 and will also move cthe end of the arm 7 toward the centero1 the turntable againstthe influence of the clamping member 10 and thespring 15. The bumper 32 is secured in adjusted position by operation ofthe set screw 30, wherefore the movement of the bar 25 on account of thetension of the spring 34, is limited and the stop 20 is prevented fromengaging the turntable 2 when moved in the direction of the arrow and ispermitted to engage the turntable 2 when in initial position as shown. Aneedle (not shown) carried by the tone arm 1 is placed in position inthe groove mto reproduce sound. While this needle is traversing thegroove between 00 and y, the tone arm 1 will be moved in the directionof the center of the machine. The stud 18 will slide in the slot 17.Consequently, pressure will be exerted by the arm 7 against the stud 18to maintain the inner end of the lever 19 in its position nearest thecenter of the turntable 2 during the entire time the tone arm 4. isbeing moved toward the center of the turntable 2. When the needle hastraversed the groove y, it is diverted into an eccentric groove 36,which has been scribed in the record 35 in the position shown. The tonearm at will be moved to an extreme central position. The direction ofits movement will thenbe reversed as the needle traverses the eccentricgroove 36 and approaches the junction of the eccentric groove 36 withthe groove 2 It is obvious that when the reversal in the direction ofmovement of the tone arm 41 occurs, pressure will be exerted by the armagainst the stud 18 to move the inner end of the lever 19 away from thecenter of the turntable 2. Consequently the outer end 21 of the lever 19will be moved into the position pictured in the accompanying drawings.The post 20 will trictionally engage the edge of the turntable 2,instantly and positively stopping the rotation of the same and will bemaintained in operative engagement therewith by the tension of thespring 34.

Many adaptations and modifications of the form of the device pictured inthe accompanying drawings may obviously be provided without departingfrom the spirit and scope of the invention as set forth in the foregoingdisclosure and outlined more particularly in the appended claims. Ithere fore consider such adaptations and modifications as my own.

I claim:

1. The combination with a sound reproducing machine including aturntable and a tone arm, the free end of the tone arm being arranged tobe moved in one direction when the turntable is being rotated, of alever fulcrumed on the casing of the sound reproducing machine, one endof th lever being arranged to extend beyond the outer edge of theturntable, means carried by said lever adjacent its outer endforfrictionally engaging the turntable to prevent the rotation thereof,means for normally holding said first named means in engagement with theturntable, means operated by the move- 115 ment of the tone arm in onedirection for maintaining said first named means out of engagement withsaid turntable and operated by the movement of the tone arm in thedirection opposite to that first men- 120 tioned for moving said firstnamed means into engagement with said turntable, whereby the rotation ofthe latter is stopped, and means for effecting a reversal in thedirection 01" movement of said tone arm.

2. The combination with a sound reproducing machine including aturntable and a tone arm, the free end of the tone arm being arranged tobe moved in one direction when the turntable is being rotated, of a 130lever fulcrumed on the casin of the sound reproducing machine, one encof the lever being arranged to extend beyond the outer edge of theturntable, means carried by said lever adjacent its outer end forfrictionally engaging the turntable to prevent the rotation thereof,adjustable means for normally holding said first named means inengagement with the turntable, means operated by the movement of thetone arm in one direction for maintaining said first named means out ofengagement with said turntable and operated by the movement of the tonearm in the direction opposite to that first mentioned for moving saidfirst named means into engagement with said turntable, whereby therotation of the latter is stopped, and means for effecting a reversal inthe direction of movement of said tone arm.

8. The combination with a sound reproducing machine including aturntable and a tone arm, the free end of the tone arm being arranged tobe moved in one direction when the turntable is being rotated, of alever fulcruined on the casing of the sound reproducing machine, one endof the lever being arranged to extend beyond the outer edge of theturntable, means carried by said lever adjacent its outer end forfrictionally engaging the turntable to prevent the rotation thereof,adjustable means for normally holding said first named means inengagement with the turntable, means operated by the movement of thetone arm in one direction for maintaining said first named means out ofengagement with said turntable and operated by the movement of the tonearm in the direction opposite to that first mentioned for moving saidfirst named means into engagement with said turntable, whereby therotation of the latter is stopped, and means for efiecting a reversal inthe direction of movement of said tone arm, said last named meansincluding a disk record disposed on said turntable to rotate therewith,said record having an inner groove eccentrically arranged with respectto the center of the turntable.

CHARLES H. TAYLOR

